Answer this question truthfully
### Question: What causes Myotonia congenita?
### Response: Myotonia congenita is caused by a change (mutation) to a gene. It is passed down from either one or both parents to the children (inherited).
Myotonia congenita is believed to be caused by a problem in the part of the muscle cells that are needed for muscles to relax. Abnormal repeated electrical discharges occur in the muscles, causing a stiffness called myotonia.